This converter features contemporary units of weight. There is also a special converter for historical units of weight you might want to visit for ancient, medieval and other old units that are no longer used.

Troy

Apothecaries

The traditional English apothecaries' system was a subset of Roman weight system except that Roman libra (pound) was slightly lighter. In 1858 apothercaries' system was officially abolished in in the U.K. in favour of the standard Avoirdupois system. However, in the United States the apothecaries' system remained in use until 1971, when it was officially abolished in favor of the metric system.

Natural units

In physics, natural units are physical units of measurement based only on universal physical constants. The origin of their definition comes only from properties of nature and not from any human construct.

Indian units (Akbar system)

The first uniform system of units was introduced in India by the third imperor Akbar I in 16th century. Before him weights and measures varied from region to region. Unfortunately, the new measures did not replace all the privious ones, they just added another system.

Akbar system of units was based on barley corn (Jau) for both weigth and length. It was widely used in India until adoption of the metric system in 1958. The weight units were slightly altered in 1833 to align with the British system. Here we provide conversion for the units after this change.

Chinese units of 1915 before 1930

Thai units

Some of these units are still in use even though metric system was formally established in 1923. Before the metrication the old units were standartied to exact metric values. The baht (current Thai currency) originated as a corresponding measure of silver. The smaller units in this section were corresponding silver coins.

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